What is Wheel Offset and Backspace?

Wednesday, August 10, 2011 by Hunter Leffel
Wheel offset anTech Article on Offsetd backspace measure the same thing but in a little different way. They tell you where in the wheel well a particular wheel will sit.

Offset is a measurement in millimeters from the backside of the mounting plate to the center line of the wheel. A positive number puts the mounting plate further away from the backside of the rim. A negative measurement moves it closer to the backside. Since offset is based on the center line, the width does factor in. That is to say an 8-inch wide +45mm offset and 7-inch wide +45mm offset results in a 1/2" difference in wheel positioning. The 8-inch wide will be further into the wheel well. To gain a better understanding of the offset of a wheel, read our tech article on this topic.

Backspace measures the distance from the mounting plate to the back edge of the wheel.  The higher the backspace the further into the fender well it will sit.

Confusing? It can be. The good news is Tire Rack takes care of all the guesswork for you. When you shop by vehicle, we'll show you options that fit your vehicle. In some instances, there may be a fitment note explaining any potential issues, but in most cases no modifications are needed.

Comments on What is Wheel Offset and Backspace?

Tuesday, February 28, 2012 by Patrick Moore:
I currently own a 2009 Chevrolet Tahoe, 2WD, LTZ (Flex Fuel). I have been shopping around for a set of 22" wheels and tires but have been confused by the different "offset" options. I have been told that a 305-40-22 tire is optimal but the wheel width and offset is confusing me. Could you possibly provide some information that will enlighten me on this matter? Thanks in advance for your help.
Tuesday, February 28, 2012 by hunter:
Hi Patrick,
The great part of how Tire Rack makes wheel recommendations is we take all of the hard work out of the equation. You can do a shop by vehicle and we will show you the wheels that will fit without rubbing and be inside the wheel well, unless otherwise noted on a specific item. The backspace and offset info is there as well for your reference.

Thanks,
Hunter
Wednesday, September 5, 2012 by Alan Paulson:
58 Chevy Biscayne. Want to run rear 255.50.17 tire on an 8" rim, and smaller diameter tire (235) on a 17 inch rim for the front. Which rims works best in this scenario
Thursday, January 3, 2013 by Marcus:
Question: Vehicle:2011 Hyundai Elantra Touring SE 17" x low profile (stock). Although the set handles well on dry pvmt,the tyres that go w/those do not meet my needs (more varied terrain/ more effect M&S. What is chance for 16" rims and higher profile tyres that accommodate more choices of tyres.
Thanks for your answer in advance.
Friday, January 4, 2013 by Hunter:
Hi Marcus,
A 205/55r16 or 215/55r16 will fit that vehicle.
Monday, March 4, 2013 by Tom Pellegrini:
so i have a pair of xd monster rims 18x9 with 18mm offset.I need to figure out the back spacing on these rims. any input i would greatly appreciate.
thanks for replies
Tuesday, March 5, 2013 by Hunter:
Tom,
That should have a backspace of around 5.75"

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